plugins: call SetContainer before we call Initialize
plugins: call SetContainer before we call Initialize

This fix is necessary for the Totem plugin on Linux, which is used
for media playing (mp3, quicktime, etc.).

BUG=19712,21224

Review URL: http://codereview.chromium.org/196105

git-svn-id: dd90618784b6a4b323ea0c23a071cb1c9e6f2ac7@26151 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser